Method and system capable of automatically recognizing non-standard charger and setting charging current of non-standard charger

Abstract

The invention discloses a method and a system capable of automatically recognizing a non-standard charger and setting charging current of the non-standard charger. The method comprises steps of calculating the cell internal resistance of a mobile terminal through preset two charging current and detection of cell voltage in the two charging current; setting that the second preset current is added every time based on the first preset current by using the mobile terminal and calculating the changing value of the cell voltage in adjacent two set charging current; determining a charger is the non-standard charger when the changing value of the cell voltage in the adjacent two set charging current is smaller than the product of the preset number of the charging current, the second preset current and the cell internal resistance; and setting that the charging current of the non-standard charger is the number that the preset number of the charging current minus one multiplies by the second preset current and then adds the first preset current. By the aid of the method and the system, the non-standard charger can be automatically recognized and the charging current of the non-standard charger can be set reasonably.

Description

technical field [0001] The invention relates to the field of mobile terminals, in particular to a method and system for automatically identifying a non-standard charger and setting its charging current. Background technique [0002] With the popularity of the micro USB interface, most mobile phones are equipped with a micro USB charger as standard, and when the user uses a non-standard charger, the problems in examples 1 and 2 will appear. [0003] Example 1: [0004] Take a 5V500mA standard charger as an example, when the software is designed, the charging current will be set to 500mA accordingly. However, if the user inserts a 5V1A non-standard charger, since the software cannot recognize the non-standard charger, the charging current set by the software is still 500mA. According to the above analysis, the actual charging current output by the charger is also 500mA Instead of 1A, therefore, it cannot really play the role of this 5V1A non-standard charger. [0005] Examp...

AI Technical Summary

Problems solved by technology

But if the user inserts a 5V500mA non-standard charger, because the software cannot recognize this non-standard charger, the charging current set by the software is still 1A, but this non-standard charger can only output a charging current of 500mA. This will lead to the following two problems: 1. The charging voltage output by the charger is pulled down, resulting in failure to charge; 2. The charger works in an over-rated output state for a long time, which affects the life of the charger, and in severe cases will cause damage to the charger. or explode

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